Flight number record
YX 5819
Republic Airways · New York to Boston
- Route
- LGA → BOS
- Departs
- 16:00
- Flights
- 302
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s YX 5819, check with Republic Airways. Republic Airways flies under contract for larger airlines, so a ticket for this flight may show a different airline code and number.
YX 5819 earns a D−, which is as low as this site's scale goes for a reason. Only 55.7% of flights arrive inside the 15-minute window, 22 points worse than the national rate of 77.3%. Late arrivals average a little over an hour. Treat any tight connection here as a coin flip. That rests on 302 flights, with a median arrival 8 minutes late.
The national on-time rate over the same period is 77.3%, so YX 5819 runs 22 points behind the country as a whole. Across a thousand flights that is about 216 extra late arrivals.
Key figures
On time
55.7%
Arrivals under 15 minutes late, of 280 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
7.28%
National rate is 1.89%
1 hour+ late
19.3%
National rate is 8.3%
These figures cover 302 flights between September 2025 and August 2026. Beyond the headline rate, 19.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When YX 5819 flies
YX 5819 is scheduled to leave New York (LGA) at 16:00 local time and reach Boston (BOS) at 17:28. That slot held for 298 of the 302 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.
- Departs 16:00298 flights98.7%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 16:00 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and YX 5819 runs 16 points worse at 55.7%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
YX 5819 next to LGA to BOS
Every carrier on LGA to BOS combined arrived on time 73.1% of the time across 7,443 flights, so YX 5819 is 17 points behind it. Republic flew 6,974 flights on the same city pair under all its flight numbers, including this one, and those ran 73.1% on time. Across its whole network Republic Airways managed 78.1%, which this flight trails by 22 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 5819thin sample | 302 | 55.7% | 70 min | 7.28% | D− |
| All Republic Airways on LGA–BOS | 6,974 | 73.1% | 70 min | 6.28% | C− |
| All carriers on LGA–BOS | 7,443 | 73.1% | 70 min | 6.17% | C− |
| Republic Airways, whole network | 364,452 | 78.1% | 74 min | 4.55% | B− |
Across the year
YX 5819 quarter by quarter
YX 5819 did not run the same all year. Its best quarter was Jan–Mar 2026 at 62.7% on time and its weakest Oct–Dec 2025 at 40.6%, a swing of 22 points on roughly 76 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202526 flights—
- Oct–Dec 202567 flights40.6%
- Jan–Mar 202674 flights62.7%
- Apr–Jun 202681 flights59.5%
- Jul–Sep 202654 flights62.2%
Scale runs 30% to 70%. Rows with fewer than 30 flights show a dash.
By weekday, YX 5819 did best on Tuesday at 60.0% on time and worst on Monday at 46.8%. Each day rests on about 43 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late YX 5819 runs when it is late
The 124 late arrivals split 31 under half an hour, 39 between 30 and 60 minutes, and 54 an hour or more.
- 15+ min early55 flights19.6%
- Within 15 min101 flights36.1%
- 15–29 min late31 flights11.1%
- 30–59 min late39 flights13.9%
- 1–2 hours late32 flights11.4%
- 2+ hours late22 flights7.9%
Scale runs 0% to 100%.
Share of 280 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 108 departures that left 15 minutes late or more, only 12 made it up before arrival. In the other direction, 28 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at BOS.
The worst days
Worst days for YX 5819
The latest arrival of the period was on 17 September 2025, 4 hours 46 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 17 September 2025 | 4 hours 46 minutes | Carrier |
| 6 May 2026 | 4 hours 39 minutes | National Airspace System |
| 11 November 2025 | 3 hours 23 minutes | Carrier |
| 26 January 2026 | 3 hours 14 minutes | Carrier |
| 28 August 2026 | 2 hours 55 minutes | Carrier |
Delay causes
Why YX 5819 runs late
National Airspace System accounts for 46% of the 8,645 delay minutes carriers reported here, and the remaining four split what is left.
- 46%National Airspace System
- 30%Late-arriving aircraft
- 25%Carrier
46% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 3,962 minutes out of 8,645, against a national NAS share of 21%. The split is drawn from 8,645 delay minutes reported on YX 5819.
Cancellations run at 7.28%, against 1.89% nationally. That is roughly one flight in fifteen cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
19.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The same number turns up on one other city pair in the data, including LGA to DCA (12), but none flew often enough under YX 5819 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to LGA to BOS only.
One caution: this is a thin sample. 302 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking YX 5819
For a booking, the cancellation rate is the figure to plan around on YX 5819: 7.28% of its 302 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- LGA to BOS, every carrier and departure
- BOS to LGA, the return direction
- Republic Airways 5725 on the same route67.4%
- Republic Airways 5761 on the same route79.0%
- Republic Airways 5745 on the same route79.5%
- Republic Airways 5746 on the same route56.0%
- Republic Airways 5727 on the same route61.5%
- LaGuardia (LGA) delay statistics
- Boston Logan International (BOS) delay statistics
- Republic Airways on-time record
- Every Republic Airways flight number with a record
- The most and least reliable flight numbers in the US
- What a cancellation rate actually tells you (and what it hides)
A flight number here means Republic Airways’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.